One-leg balances make good stretches for post-workout as well. For example, try holding the classic runner’s quadriceps stretch (bend one leg behind you, aiming your foot at your buttocks, and hold your ankle with your hand. Be careful to keep your knees aligned) for 30 seconds on each leg, without relying on a chair or wall for support.
"Life is like riding a bike, to balance you must keep moving." Albert Einstein
This dynamic balance exercise is great with a tennis racket or golf club in hand: Stand on one leg, holding the club or racket in the opposite hand; quickly shift your weight onto the other foot as you switch hands; stabilize and hold. Make it more difficult by hopping, adding pivots, swinging the racket or shifting focus.
At home, stand on one leg while doing dishes, brushing your teeth, fixing your hair or cooking. Once you get confident, you can also make it more difficult by trying to balance on an unstable surface, like a soft pillow.